Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cf6772cf46e3c43…

MALICIOUS

PDF

54.2 KB Created: 2020-08-10 09:30:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2dec2bd256dcb8c815203df4a46e1117 SHA-1: c5fc43a7dbfc5f3ee3d2b6179b56e4dad7530871 SHA-256: 8cf6772cf46e3c43f0623c04ff77b0f1b5ff3d6536fcc4e4220fcc4a6d633395
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, embedding numerous external links, with the first identified link also pointing to a Shopify domain. The ML classifier also strongly indicated maliciousness. The document body contains the malicious URL and appears to be a lure for downloading a sociology PDF, which is likely a pretext for redirecting the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/pify?keyword=sleepyclasses+sociology+pdf+download
    • http://files.lighthouse.group/uploads/1/3/0/8/130814758/546903.pdf
    • http://files.karengolland.com/uploads/1/3/1/6/131607029/127553.pdf
    • http://jumabukir.sustainability-and-social-innovation.com/uploads/1/3/1/3/131384429/karomugemesawu.pdf
    • http://files.pulse-uca.org/uploads/1/3/1/3/131379639/kevowaxufi.pdf
    • http://www.insights
    • https://cdn.shopify.com/s/files/1/0433/9436/7644/files/klasifikasi_anemia_adalah.pdf
    • https://cdn.shopify.com/s/files/1/0435/0876/0735/files/27835478288.pdf
    • https://cdn.shopify.com/s/files/1/0431/1682/2692/files/more_player_models_1._13.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7654/files/89061751018.pdf
    • https://cdn.shopify.com/s/files/1/0434/5459/5224/files/comment_faire_l_adoration_du_saint_sacrement.pdf
    • https://cdn.shopify.com/s/files/1/0433/5294/8901/files/36091663011.pdf
    • https://cdn.shopify.com/s/files/1/0434/5344/8358/files/important_of_communication_skills.pdf
    • https://cdn.shopify.com/s/files/1/0429/3482/9223/files/79760966396.pdf
    • https://cdn.shopify.com/s/files/1/0427/9717/0847/files/93711974875.pdf
    • https://cdn.shopify.com/s/files/1/0433/7470/6853/files/74719947308.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/nulifagavukaxubodipiripu.pdf
    • https://cdn.shopify.com/s/files/1/0429/5933/9674/files/29452311061.pdf
    • https://cdn.shopify.com/s/files/1/0434/5528/3350/files/66692456179.pdf
    • https://cdn.shopify.com/s/files/1/0430/8657/7828/files/afro_american_writing_an_anthology_of_prose_and_poetry.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000095e9.bin
7dfb49d1880d4ac383003b6bec291aef30b6b3eb964d4ad631fa48f13fca1a89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95E9 5524 bytes
font_01_sfnt_off0000a8e3.bin
765da523c31f01579f3afe2c1ab18e286a1da19787e368d0ce7cf768367c641a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8E3 10120 bytes

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